Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 190, NWS Phoenix, AZ

August 16, 2021Gila County, Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 16, 2021, 10:36 PM MST for Gila County, Maricopa County, Arizona. It was in force for 10 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 16, 2021, 10:36 PM MST (05:36 UTC)
Expired
Aug 17, 2021, 8:30 AM MST
In force
10 hr
Issued by
NWS Phoenix, AZ
Area
Storm-based polygon
Damage threat
Considerable
Flood severity
None

Counties Gila County, AZ, Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 54 km from the middle of the area, began a volume at 05:39 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 5.6 hours before the alert went out and 66 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Phoenix, AZ at 00:00Z on 2021-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2667 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phoenix, AZ at 00:00Z on 2021-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2667 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1942 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
44 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

226 
WGUS55 KPSR 170536
FFWPSR
AZC007-013-171330-
/O.NEW.KPSR.FF.W.0190.210817T0536Z-210817T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
1036 PM MST Mon Aug 16 2021

The National Weather Service in Phoenix has issued a

* Flash Flood Warning for...
  The Bush burn scar in...
  Gila County in east central Arizona...
  Maricopa County in south central Arizona...

* Until 630 AM MST Tuesday.

* At 1036 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain over the Bush Burn Scar. Between 1 and 2 inches of rain 
  have fallen. Additional rainfall amounts of 0.5 to 1 inch are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

Excessive rainfall over the burn scar will result in debris flow 
moving through the Bush. The debris flow can consist of rock, mud, 
vegetation and other loose materials.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding in and around the Bush Burn
           Scar.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of areas in and around
           the Bush Burn Scar.

* Some locations that will experience flash flooding include...
  Four Peaks, Tonto Basin, Apache Lake and Punkin Center.

This includes the following highways...
	AZ Route 188 between mile markers 254 and 260.

This includes the following streams and drainages...
  Ash Creek, Picadilla Creek, Barranca Creek, Lewis and Pranty 
  Creek, Boulder Creek, Mesquite Wash, Camp Creek, Pine Creek, 
  Tortilla Creek, Salt River, Alder Creek, Sycamore Creek, Buckhorn 
  Creek, Bronco Creek, Cottonwood Creek and Burnt Corral Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a life threatening situation. Heavy rainfall will cause 
extensive and severe flash flooding of creeks...streams...and 
ditches in the Bush Burn Scar. Severe debris flows can also be 
anticipated across roads. Roads and driveways may be washed away in 
places. If you encounter flood waters...climb to safety.

Move away from recently burned areas. Life-threatening flooding of 
creeks, roads and normally dry arroyos is likely. The heavy rains 
will likely trigger rockslides, mudslides and debris flows in steep 
terrain, especially in and around these areas.

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3362 11121 3360 11120 3356 11128 3353 11131
      3356 11136 3357 11139 3359 11140 3363 11141
      3368 11141 3377 11145 3382 11144 3386 11139
      3386 11134 3384 11129 3378 11124 3375 11128
      3370 11124

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Hirsch
2 follow-up statements
861 
WGUS55 KPSR 171248
FFWPSR
AZC007-013-171530-
/O.EXT.KPSR.FF.W.0190.000000T0000Z-210817T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
548 AM MST Tue Aug 17 2021

The National Weather Service in Phoenix has extended the

* Flash Flood Warning for...
  The Bush burn scar in...
  Gila County in east central Arizona...
  Maricopa County in south central Arizona...

* Until 830 AM MST.

* At 548 AM MST, Doppler radar indicated thunderstorms producing 
  heavy rain over the Bush Burn Scar. Between 1 and 2 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

Excessive rainfall over the burn scar will result in debris flow 
moving through the Bush. The debris flow can consist of rock, mud, 
vegetation and other loose materials.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding in and around the Bush Burn
           Scar.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of areas in and around
           the Bush Burn Scar.

* Some locations that will experience flash flooding include...
  Four Peaks, Tonto Basin, Apache Lake and Punkin Center.

This includes the following highways...
	AZ Route 188 between mile markers 254 and 260.

This includes the following streams and drainages...
  Ash Creek, Picadilla Creek, Barranca Creek, Lewis and Pranty 
  Creek, Boulder Creek, Mesquite Wash, Camp Creek, Pine Creek, 
  Tortilla Creek, Salt River, Alder Creek, Sycamore Creek, Buckhorn 
  Creek, Bronco Creek, Cottonwood Creek and Burnt Corral Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a life threatening situation. Heavy rainfall will cause 
extensive and severe flash flooding of creeks...streams...and 
ditches in the Bush Burn Scar. Severe debris flows can also be 
anticipated across roads. Roads and driveways may be washed away in 
places. If you encounter flood waters...climb to safety.

Move away from recently burned areas. Life-threatening flooding of 
creeks, roads and normally dry arroyos is likely. The heavy rains 
will likely trigger rockslides, mudslides and debris flows in steep 
terrain, especially in and around these areas.

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3362 11121 3360 11120 3356 11128 3353 11131
      3356 11136 3357 11139 3359 11140 3363 11141
      3368 11141 3377 11145 3382 11144 3386 11139
      3386 11134 3384 11129 3378 11124 3375 11128
      3370 11124

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Hirsch
014 
WGUS75 KPSR 171526
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
826 AM MST Tue Aug 17 2021

AZC007-013-171536-
/O.EXP.KPSR.FF.W.0190.000000T0000Z-210817T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila AZ-Maricopa AZ-
826 AM MST Tue Aug 17 2021

...FLASH FLOOD WARNING FOR THE BUSH BURN SCAR WILL EXPIRE AT 830 AM 
MST THIS MORNING FOR GILA AND MARICOPA COUNTIES...

Flood waters have receded. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3362 11121 3360 11120 3356 11128 3353 11131
      3356 11136 3357 11139 3359 11140 3363 11141
      3368 11141 3377 11145 3382 11144 3386 11139
      3386 11134 3384 11129 3378 11124 3375 11128
      3370 11124

$$

Iniguez

The office that day

Everything else NWS Phoenix, AZ issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 16, 5:15 PM MSTSpecial Weather StatementPSRGila45 min
Aug 16, 5:46 PM MSTSpecial Weather StatementPSR44 min
Aug 16, 6:07 PM MSTSpecial Weather StatementPSRGila38 min
Aug 16, 6:14 PM MSTSevere Thunderstorm WarningPSRGila46 min
Aug 16, 6:37 PM MSTSpecial Weather StatementPSRPinal53 min
Aug 16, 6:55 PM MSTFlash Flood Warning Considerable damage threatPSRGila6 hr
Aug 16, 8:24 PM MSTSpecial Weather StatementPSR51 min
Aug 16, 8:41 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa5 hr
Aug 16, 8:53 PM MSTSpecial Weather StatementPSRGila52 min
Aug 16, 9:08 PM MSTSpecial Weather StatementPSRGila52 min
Aug 16, 9:22 PM MSTSevere Thunderstorm WarningPSRGila, Maricopa, Pinal38 min
Aug 16, 9:41 PM MSTSevere Thunderstorm WarningPSRGila, Maricopa, Pinal49 min
Aug 16, 9:49 PM MSTSevere Thunderstorm Warning Considerable damage threatPSRGila, Maricopa41 min
Aug 16, 10:01 PM MSTFlash Flood Warning Considerable damage threatPSRGila4 hr
Aug 16, 10:01 PM MSTSpecial Weather StatementPSR44 min
Aug 16, 10:05 PM MSTFlash Flood Warning Considerable damage threatPSRGila4 hr
Aug 16, 10:14 PM MSTSevere Thunderstorm Warning Considerable damage threatPSRGila, Maricopa, Pinal46 min
Aug 16, 10:22 PM MSTFlash Flood Warning Considerable damage threatPSRGila10 hr
Aug 16, 10:28 PM MSTFlash Flood Warning Considerable damage threatPSRGila, Maricopa, Pinal10 hr
Aug 16, 10:38 PM MSTDust Storm AdvisoryPSRMaricopa, Pinal67 min
Aug 16, 10:48 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa, Pinal9 hr
Aug 16, 10:54 PM MSTSevere Thunderstorm Warning Destructive damage threatPSRMaricopa, Pinal51 min
Aug 16, 10:58 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa7 hr
Aug 16, 11:04 PM MSTDust Storm WarningPSRMaricopa, Pinal56 min
Aug 16, 11:07 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa, Pinal7 hr
Aug 16, 11:16 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa7 hr
Aug 16, 11:26 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa, Pinal8 hr
Aug 16, 11:31 PM MSTSevere Thunderstorm WarningPSRMaricopa44 min
Aug 16, 11:41 PM MSTSevere Thunderstorm Warning Considerable damage threatPSRMaricopa, Pinal49 min
Aug 16, 11:47 PM MSTDust Storm WarningPSRMaricopa58 min
Aug 16, 11:50 PM MSTSpecial Weather StatementPSR40 min
Aug 16, 11:52 PM MSTSevere Thunderstorm WarningPSRMaricopa38 min
Aug 16, 11:56 PM MSTFlash Flood Warning Considerable damage threatPSRPinal7 hr
Aug 16, 11:59 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa6 hr
Aug 17, 12:01 AM MSTDust Storm WarningPSRMaricopa, Pinal59 min
Aug 17, 12:09 AM MSTFlash Flood Warning Considerable damage threatPSRMaricopa, Pinal8 hr
Aug 17, 12:32 AM MSTSpecial Weather StatementPSR43 min
Aug 17, 12:36 AM MSTSpecial Weather StatementPSRMaricopa24 min
Aug 17, 4:05 AM MSTAreal Flood AdvisoryPSRMaricopa4 hr
Aug 17, 4:26 AM MSTFlash Flood Warning Considerable damage threatPSRMaricopa6 hr
Aug 17, 5:29 AM MSTSpecial Weather StatementPSRMaricopa76 min
Aug 17, 5:35 AM MSTFlash Flood Warning Considerable damage threatPSRMaricopa6 hr
Aug 17, 6:26 AM MSTFlash Flood Warning Considerable damage threatPSRGila, Pinal5 hr
Aug 17, 8:42 AM MSTAreal Flood WarningPSRGila5 days
Aug 17, 4:46 PM MSTSpecial Weather StatementPSR44 min

Nearby

Flash Flood Warnings in Arizona, 2021Every flash flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.